Quantification of Pulmonary Arterial Wall Distensibility Using Parameters Extracted from Volumetric Micro-CT Images

Stiffening, or loss of distensibility, of arterial vessel walls is among the manifestations of a number of vascular diseases including pulmonary arterial hypertension. We are attempting to quantify the mechanical properties of vessel walls of the pulmonary arterial tree using parameters derived from high-resolution volumetric x-ray CT images of rat lungs. The pulmonary arterial trees of the excised lungs are filled with a contrast agent. The lungs are imaged with arterial pressures spanning the physiological range. Vessel segment diameters are measured from the inlet to the periphery, and distensibilities calculated from diameters as a function of pressure. The method shows promise as an adjunct to other morphometric techniques such as histology and corrosion casting. It possesses the advantages of being nondestructive, characterizing the vascular structures while the lungs are imaged rapidly and in a near-physiological state, and providing the ability to associate mechanical properties with vessel location in the intact tree hierarchy

A study of the effects of micro-gravity on seed germination

This study will identify characteristics of seed germination dependent upon gravity. To accomplish this objective, four different seed types will be germinated in space and then be compared to a control group germinated on Earth. Both the experimental and control groups will be analyzed on the cellular level for the size of cells, structural anomalies, and gravitational effects. The experiment will be conducted in a Get Away Special Canister (GAS Can no. 608) owned by the U.S. Space and Rocket Center and designed for students. The GAS Can will remain in the cargo bay of the Space Shuttle with minimal astronaut interaction

Recovery of critically endangered Nassau grouper (Epinephelus striatus) in the Cayman Islands following targeted conservation actions.

Many large-bodied marine fishes that form spawning aggregations, such as the Nassau grouper (Epinephelus striatus), have suffered regional overfishing due to exploitation during spawning. In response, marine resource managers in many locations have established marine protected areas or seasonal closures to recover these overfished stocks. The challenge in assessing management effectiveness lies largely in the development of accurate estimates to track stock size through time. For the past 15 y, the Cayman Islands government has taken a series of management actions aimed at recovering collapsed stocks of Nassau grouper. Importantly, the government also partnered with academic and nonprofit organizations to establish a research and monitoring program (Grouper Moon) aimed at documenting the impacts of conservation action. Here, we develop an integrated population model of 2 Cayman Nassau grouper stocks based on both diver-collected mark-resight observations and video censuses. Using both data types across multiple years, we fit parameters for a state-space model for population growth. We show that over the last 15 y the Nassau grouper population on Little Cayman has more than tripled in response to conservation efforts. Census data from Cayman Brac, while more sparse, show a similar pattern. These findings demonstrate that spatial and seasonal closures aimed at rebuilding aggregation-based fisheries can foster conservation success

Tantalum oxide coatings as candidate environmental barriers

Tantalum (Ta) oxide, due to its high-temperature capabilities and thermal expansion coefficient similar to silicon nitride, is a promising candidate for environmental barriers for silicon (Si) nitride-based ceramics. This paper focuses on the development of plasma-sprayed Ta oxide as an environmental barrier coating for silicon nitride. Using a D-optimal design of experiments, plasma-spray processing variables were optimized to maximize coating density. The effect of processing variables on coating thickness was also determined. X-ray diffraction (XRD) was use to ascertain that the as-sprayed coatings were comprised of α- and β-Ta2O5, but were fully converted to β-Ta_2O_5 after a 1200 °C heat treatment. Grain growth of the Ta_2O_5 followed a time dependence of t^(0.2) at 1200 °C

A Tale of Two (and Possibly Three) Atkins: Intellectual Disability and Capital Punishment Twelve Years after The Supreme Court\u27s Creation of a Categorical Bar

This article examines empirically the capital cases decided by the lower courts since the United States Supreme Court created the categorical ban against the execution of persons with intellectual disability twelve years ago in the Atkins decision

A Tale of Two (and Possibly Three) Atkins: Intellectual Disability and Capital Punishment Twelve Years after The Supreme Court\u27s Creation of a Categorical Bar

This article examines empirically the capital cases decided by the lower courts since the United States Supreme Court created the categorical ban against the execution of persons with intellectual disability twelve years ago in the Atkins decision

Thermal and Pressure Characterization of a Wind Tunnel Force Balance Using the Single Vector System

Wind tunnel research at NASA Langley Research Center s 31-inch Mach 10 hypersonic facility utilized a 5-component force balance, which provided a pressurized flow-thru capability to the test article. The goal of the research was to determine the interaction effects between the free-stream flow and the exit flow from the reaction control system on the Mars Science Laboratory aeroshell during planetary entry. In the wind tunnel, the balance was exposed to aerodynamic forces and moments, steady-state and transient thermal gradients, and various internal balance cavity pressures. Historically, these effects on force measurement accuracy have not been fully characterized due to limitations in the calibration apparatus. A statistically designed experiment was developed to adequately characterize the behavior of the balance over the expected wind tunnel operating ranges (forces/moments, temperatures, and pressures). The experimental design was based on a Taylor-series expansion in the seven factors for the mathematical models. Model inversion was required to calculate the aerodynamic forces and moments as a function of the strain-gage readings. Details regarding transducer on-board compensation techniques, experimental design development, mathematical modeling, and wind tunnel data reduction are included in this paper

A qualitative comparison of DSM depression criteria to language used by older church-going African Americans

Objective: Depression in late life is associated with substantial suffering, disability, suicide risk, and decreased health-related quality of life. According to the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV), a depression diagnosis is derived from a constellation of symptoms that may be described differently by different people. For example, the DSM language may be inadequate in capturing these symptoms in certain populations such as African-Americans, whose rates of depression misdiagnosis is high. Methods: This study reports the findings from a church-based, qualitative study with older African Americans (n = 50) regarding the language they use when discussing depression and depression treatment, and how this compares to the DSM-IV depression criteria. Content analyses of the in-depth discussions with African-American male and female focus group participants resulted in a deeper understanding of the language they used to describe depression. This language was then mapped onto the DSM-IV depression criteria. Results: While some words used by the focus group participants mapped well onto the DSM-IV criteria, some of the language did not map well, such as language describing irritability, negative thought processes, hopelessness, loneliness, loss of control, helplessness, and social isolation. Conclusions: The focus group setting provided insight to the language used by older, church-going African-Americans to describe depression. Implications include the advantages of using qualitative data to help inform clinical encounters with older African-Americans.This project was supported by the Program for Positive Aging in the Department of Psychiatry at the University of Michigan, and the original study was titled ‘Attitudes, perceptions, and beliefs pertaining to mental health, depression, and depression care of elder African-American church attendees’ (Principal Investigator: Helen Kales, MD, UM Department of Psychiatry).Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/152353/1/Akinyemi Watkins Kavanagh Johnson-Lawrence Lynn Kales_2017_A qualitative comparison of DSM depression criteria to language used by older church going African Americans.pd